Define Electrolysis.
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chemical decomposition by passing through electric current through a liquid containing ions is called elecrtolysis
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It is a process in which ionic substances ( they are charged particle) are decomposed into the simpler substances when an electric current is pass through it.
Example :- Sodium (Na), magnesium (Mg) and calcium (Ca) are obtain by electrolysis of their molten chlorides. The metals are deposited at the cathode ( they are negatively charged ion ) whereas chlorine is liberated at the anode ( they are positively charged ion ).
At cathode :- Na^+ + e^- --> Na
At anode :- 2Cl^- --> Cl2 + 2e^-
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